KVM: selftests: Add common helper to get mask+number of usable memory NUMA nodes

Extract and slightly adopt the xAPIC IPI test's logic for getting the mask
and number of usable memory NUMA nodes into a common helper.  To allow for
friendlier behavior when the underlying kernel doesn't support NUMA, or the
test was run without sufficient permissions, zero out the mask and return
"zero nodes" if get_mempolicy() fails with ENOSYS or EPERM respectively.
I.e. allow tests to skip (sub)tests instead of throwing an assert.

Suggested-by: Shivank Garg <shivankg@amd.com>
Reviewed-by: Shivank Garg <shivankg@amd.com>
Link: https://patch.msgid.link/20260903001625.2792367-6-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

0 files changed, 0 insertions, 0 deletions